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65% of students in your school participate in at least one after school activity. if there are 980 students in you school, how many do not participate in an after school activity?

Me. i can't figure out this question. give an explanation too. .

Two cars which are 40 miles apart start moving simultaneously in the same direction with constant speeds. if the speed of the car which is behind is 56 mph and the speed of the other car is 48 mph, how many hours will it take for the car which is behind to catch up the car ahead of it?